If you were a reasonably sane, honest person who wasn't prone to exaggeration before you developed symptoms, why would your personality suddenly change? Sphincter of Oddi and Pancreatitis
attacks can cause extreme pain, nausea, vomiting, diarrhea, tachycardia (heart rate increase), sweating, blood pressure increase, etc., etc. These things can also cause 24/7 pain. I just answered a question about this, so I'm going to be a loser and cut and paste.